Ex acts like we are still dating?

My ex boyfriend and I broke up a couple of months ago (he broke up with me because he said he would never be able to prioritize me over himself). We still spend most of our free time together going on dates, have sex, talk all day every day, still brings me around his family, and he goes out of his way to do things for me. However, we had an argument and he felt the need to reiterate that we are just friends and he is totally fine with me seeing other people when I never said I thought we were back together. So what gives?
Ex acts like we are still dating?
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